(A) A member may make application for the purchase of service credit under section 3307.73 of the Revised Code if a total of at least one and one-half years of contributing service under this system or eighteen months of contributing service credit under the public employees retirement system or the school employees retirement system has been established. A member who is also a member of the public employees retirement system or the school employees retirement system is ineligible to purchase service credit under this system if the unadjusted service credit established under either one of those systems exceeds the service credit established under this system.
(B) The member shall request that the employer for whom the service was performed certify such service to this system. Once certification is received from the employer, the amount of service credit otherwise qualifying for purchase shall be determined as follows:
(1) If the service credit to be purchased is for service waived or exempted under Chapter 3307. of the Revised Code or denied pursuant to rule 3307-4-01 of the Administrative Code, upon receipt of the certification of the employer, the system shall determine the amount of service credit that would have been earned had the service not been waived, exempted or denied.
(2) If the service credit to be purchased is for service that would have been covered under Chapter 145. or Chapter 3309. of the Revised Code, the system shall contact the applicable retirement system and shall request certification from that retirement system that the service was exempt.
(3) Service credit may not be purchased for any service:
(a) Which is concurrent with any other service credit that will be used in calculating a benefit under Chapter 145., Chapter 3307., or Chapter 3309. of the Revised Code; or
(b) If the purchase would result in the establishment of total service credit under Chapter 145., Chapter 3307., and Chapter 3309. of the Revised Code which exceeds a year of service credit in any year.
(C) Once service qualifying for purchase has been certified and determined pursuant to paragraph (B) of this rule, the cost for the purchase of service credit under section 3307.70 of the Revised Code shall be determined as specified in rule 3307:1-3-13 of the Administrative Code.